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corrosion behavior of NiCr alloys in HCl-containing oxidation atmosphere at 700800 ℃

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中国有色金属学会会刊：英文版 2004年第3期14卷 543-549页

作者：张轲牛焱潘太军吴维 State key laboratory for Metals corrosion and protection

corrosion behaviors of pure Ni and three NiCr alloys were investigated in an HCl-containing oxidizing atmosphere at 700 ℃ and 800 ℃. All materials suffer from accelerated corrosion at both temperatures. NiCr alloys show an initial mass loss due to the formation of volatile CrCl3 and CrO2Cl2. Some chlorides are detected at the scale/substrate interface and many voids are also found there. NiCr alloys with higher chromium content have better corrosion resistance. However, Ni50Cr is inferior to Ni25Cr due to its two-phase structure, which makes it easy for chlorine to diffuse along grain boundary and to occur inner oxidation. The relevant corrosion mechanism was also discussed.

关键词： NiCr合金高温氧化腐蚀氯化氢 Ni50Cr Ni25Cr

corrosion behavior of metals or alloys with a solid NaCl deposit in wet oxygen at medium temperature

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Science China(Technological Sciences) 2012年第2期55卷 369-376页

作者： LIU Li LI Ying WANG FuHui sate key laboratory for corrosion and protection Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

The corrosion of metals or alloys under solid NaCl deposit in wet oxygen （water vapor and oxygen） at medium temperature 4013-700℃ causes serious damage and has received considerable attention in recent years. Series of mechanistic studies have revealed synergistic interactions between solid NaCl and water vapor, which accelerates the corrosion process. In addition, the overall corrosion process comprises both chemical reactions （oxidation） and electrochemical reactions and their mutual inter- actions depend on the system of interest. Interestingly, the wet oxygen environment was found to modify the reactions of the element Cr, which plays a useful role in corrosion protection in this special environment.

关键词： synergistic effect NaCl deposit water vapor electrochemical reactions

Effects of Carbon Content and Microstructure on corrosion Property of New Developed Steels in Acidic Salt Solutions

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Acta Metallurgica Sinica(English Letters) 2014年第1期27卷 115-123页

作者： Feilong Sun Xiaogang Li Xuequn Cheng corrosion and protection Center University of Science and Technology Beijing key laboratory of corrosion and protection(Ministry of Education)

New steels with different carbon contents were self-developed by thermo-mechanical controlled processing. The effects of the carbon content and the microstructure on the corrosion properties of new steels were investigated by immersion test and SEM. The results indicated that the ferrite phase （both the proeutectoid and eutectoid ferrite） dissolved preferentially. Cementite reserved and accumulated on the surface. As carbon content increased, the content of ferrite decreased and cathode/anode area ratio increased. Therefore, the corrosion rate of new steels increased from 0.30 to 0.90 mm/years when the carbon content rose from 0.05 to 0.13 wt%. The corrosion process of new steels was studied using electrochemical impedance spectroscopy experiments during 72 h. It indicated that the impedance modulus *** nz of the new steels reduces with the increase of the immersion time. While the corrosion process of the new steel with 0.11 wt% C developed faster than that with 0.07 wt% C, although their *** nz was similar at the initial stage.

关键词： Carbon content Microstructure corrosion behavior Electrochemical impedance spectroscopy SEM

Effect of grain size on high-temperature oxidation behavior of Cu-80Ni alloy

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中国有色金属学会会刊：英文版 2003年第4期13卷 907-911页

作者：曹中秋牛焱曹丽杰吴维 Department of Chemistry State key laboratory for corrosion and protection

The thermogravimetric analysis of binary Cu 80Ni alloys prepared respectively by conventional casting(CA) and mechanical alloying(MA) techniques and presenting widely different grain sizes was performed at 800 ℃ in air in order to study the effect of grain size change on the oxidation behavior of a solid solution alloy. The results show that the kinetic curves for the oxidation of the two alloys are complex and deviate from the parabolic rate law and usually are not composed of a single stage. Mixed scales were produced on the CACu 80Ni alloy surface, which consists of a mixture of copper and nickel oxides. However, oxide scale for MACu 80Ni alloy is mainly composed of a thick compact and continuous inner layer of nickel oxide. The reduction in the alloy grain size speeds up the diffusion of the more reactive component nickel from the alloy to alloy/oxide scale interface and completes the transition from a mixed scale to continuous scale of nickel oxide.

关键词： Cu-80Ni合金高温氧化晶粒尺寸铜合金机械合金化铸造合金

Effects of Applied Magnetic Field on corrosion of Beryllium Copper in NaCl Solution

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Journal of Materials Science & Technology 2010年第4期26卷 355-361页

作者： Jing Hu, Chaofang Dong, Xiaogang Li and Kui Xiao corrosion & protection Center, University of Science and Technology Beijing, key laboratory for corrosion and protection of Ministry of Education, Beijing 100083, China corrosion & protection Center University of Science and Technology Beijing Key Laboratory for Corrosion and Protection of Ministry of Education Beijing 100083 China

The effects of an applied magnetic field on the corrosion process of beryllium copper in NaCl solution have been investigated by electrochemical measurements, scanning electron microscopy （SEM） and energy dispersive spectroscopy （EDS）. The results showed that a horizontal magnetic field with 0.4 T barely shifted the open circuit potentials （Ecorr） of beryllium copper in NaCl solution with different concentrations. However, the horizontal magnetic field increased the limiting current density of beryllium copper in NaCl solution with low concentration, while decreased the limiting current density of beryllium copper in NaCl solution with high concentration. It was found that magnetic field accelerated the diffusion of CuCl2- away from the electrode surface and delayed the formation of Cu2O. The results of SEM and EDS showed that the inffuence of magnetic field over the elements distribution of the corrosion products differed from the different concentration of the immersion solution.

关键词： Beryllium copper Magnetic field corrosion

Cavitation erosion behavior of nickel-aluminum bronze weldment

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中国有色金属学会会刊：英文版 2003年第6期13卷 1317-1324页

作者：李小亚闫永贵许振明李建国 State key laboratory of Metal Matrix Composites State key laboratory for Marine corrosion and protection

Cavitation erosion behavior of nickel-aluminum bronze(NAB) weldment in 3.5% NaCl aqueous solution was studied by magnetostrictive vibratory device for cavitation erosion. The results show that cavitation erosion resistance of the weld zone(WZ) of the weldment is superior to that of the base metal. SEM observation of eroded specimens reveals that the phases undergoing selective attack by the stress of cavitation erosion at the early stage of cavitation erosion are: martensite in the WZ, α phase in the heat-affected zone(HAZ) and eutectoidal phase in the base metal; the microcracks causing cavitation damage initiate at the phase boundaries.

关键词：青铜镍铝空蚀 TIG焊焊接热影响区 SEM

corrosion behavior of LY11 aluminum alloy in soil

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中国有色金属学会会刊：英文版 1999年第4期9卷 796-798页

作者：孙成李洪锡高利群张淑泉 State key laboratory for corrosion and protection Institute of Corrosion and Protection of Metals Chinese Academy of Sciences Shenyang 110015 China

The corrosion behavior of LY11 aluminum alloy in acid, alkaline and neutral soil after burying for 1, 3 and 5 a was studied. It is shown that localized corrosion is the major behavior Of LY11 aluminum alloy in soil, and corrosion of LY11 depends on the soil texture: severe corrosion oecurs in the heterogeneous alkaline and acid soil, and slight corrosion occurs in homogeneous neutral and acid clay soil.

关键词： LY11 aluminum alloy soil corrosion corrosion behavior

Characterization and Comparison of Conducting Polyaniline Synthesized by Three Different Pathways

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Journal of Wuhan University of Technology(Materials Science) 2011年第6期26卷 1068-1072页

作者：董超芳 corrosion & protection Center University of Science and Technology Beijing key laboratory for corrosion and protection of Ministry of Education

The conducting polyaniline （PANI） prepared by three chemical oxidative polymerization pathways including microemulsion, emulsion and aqueous solution methods were studied and compared. Their structures, morphologies and properties were characterized using FT-IR, XRD, TEM and TGA. PANI particles formed in aqueous solution have a smallest size and doping HCl enables to increase their conductivity. In contrast, PANI particles prepared by emulsion method have the highest thermal stability and conductivity and more ordered morphology. Rather different from these two methods, microemulsion approach allows forming nanocomposite PANI with tube-like nanostructure.

关键词： nano materials polymers polyaniline

Influence factors on stress corrosion cracking of P 110 tubing steel under CO2 injection well annulus environment

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Journal of Central South University 2016年第4期23卷 757-764页

作者：刘智勇赵天亮刘然克贾静焕杜翠薇李晓刚 corrosion and protection Center University of Science and Technology Beijing key laboratory of corrosion and Prevention of Ministry of Education

Stress corrosion cracking （SCC） behavior of P 110 tubing steel in simulated C02 injection well annulus environments was investigated through three-point bent tests, potentiodynamic polarization and EIS measurements. The results demonstrate that SCC of P110 tubing steel could occur in acidulous simulated environment, and the sensitivity of SCC increases with the decrease ofpH, as well as increase of sulfide concentration and total environmental pressure. Both anodic dissolution and hydrogen embrittlement make contributions to the SCC. Adequate concentration of corrosion inhibitor can inhibit the occurrence of SCC on account of the inhibition of localized anodic dissolution and cathodic hydrogen evolution.

关键词： P110 tubing steel stress corrosion cracking annulus environment C02 flooding